Question 1

What reading level is the 21st Century Skills Library: Animal Invaders series?

Accepted Answer

The 21st Century Skills Library: Animal Invaders series by Susan Heinrichs Gray is at a Grades 4.9–5.9 reading level (average Grade 5.4). Intended for Middle Grades (Ages 9–12). There are 7 books in the series.

Question 2

What order should I read the 21st Century Skills Library: Animal Invaders books?

Accepted Answer

The 21st Century Skills Library: Animal Invaders series has 7 books in order: 1. Bullfrog, 2. Emerald Ash Borer (Animal Invaders), 3. Giant African snail, 4. Starling (Animal Invaders), 5. Termite, and 2 more.

Question 3

What age is the 21st Century Skills Library: Animal Invaders series appropriate for?

Accepted Answer

The 21st Century Skills Library: Animal Invaders series is recommended for Middle Grades (Ages 9–12). The average content intensity is 1/5.

#	Title	Reading Level	Content
1	Bullfrog Susan Heinrichs Gray	Level 5-6	Gentle
2	Emerald Ash Borer (Animal Invaders) Susan Heinrichs Gray	Level 5-6	Gentle
3	Giant African snail Susan Heinrichs Gray	Level 5-6	Gentle
4	Starling (Animal Invaders) Susan Heinrichs Gray	Level 4-5	Gentle
5	Termite Susan Heinrichs Gray	Level 5-6	Gentle
6	Walking catfish Susan Heinrichs Gray	Level 5-6	Gentle
7	Wild boar Barbara A. Somervill	Level 5-6	Gentle

21st Century Skills Library: Animal Invaders Books in Order

Content Intensity Across the Series

21st Century Skills Library: Animal Invaders Reading Order

All 21st Century Skills Library: Animal Invaders Books

Bullfrog

Emerald Ash Borer (Animal Invaders)

Giant African snail

Starling (Animal Invaders)

Termite

Walking catfish

Wild boar